Features:1. With LED light indication2. Communication: USB/ PS 2/ RS232/ TTL for your choice3. Manual swipe to read/write data with a single pass, Bi - Directional4. 3-track version can read all three tracks data, 300-4000 oe5. Low power consumption, good compatibility6. Easy Programmable for projects7. Readers can be affixed to most computer keyboards or to any flat surface8. Can be connected to any PC or Mac via keyboard wedge or USB interface